Here is the transcribed problem:

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$**$P$40.**$ A block of mass $\backslash ($ m $=2\mathrm{.}00\backslash ,\backslash$text$\{$kg$\}\backslash )$ is attached to a horizontally$-$oriented spring of force constant $\backslash ($ k $=500\backslash ,\backslash$text$\{$N$/$m$\}\backslash ).$ The block is pulled to a position $\backslash ($ x $=5\mathrm{.}00\backslash ,\backslash$text$\{$cm$\}\backslash )$ to the right of equilibrium and released from rest. Find the speed the block has as it passes through equilibrium if:

$($a$)$ The horizontal surface is frictionless, and

$($b$)$ The coefficient of friction between the block and surface is $\backslash (\backslash$mu$\_$k $=0\mathrm{.}350\backslash ).$